On Tue, 19 Mar 2002, Arjan van de Ven wrote:> On Thu, Mar 14, 2002 at 02:46:39PM +0000, Hugh Dickins wrote:> > > > Few modules take an interest in ptes, that's as it should be, and so> > few modules build to different binaries with CONFIG_X86_PAE off or on> > (modulo module versions).> > Well dma_addr_t and some others also change size..... struct page also> changes quite a bit

I believe it's CONFIG_HIGHMEM you're thinking of there: dma_addr_tand struct page do depend on CONFIG_NOHIGHMEM/CONFIG_HIGHMEM in recentkernels, but not on CONFIG_HIGHMEM4G/CONFIG_HIGHMEM64G(CONFIG_X86_PAE).

I don't know why it's CONFIG_HIGHMEM rather than CONFIG_HIGHMEM64Gthat decides the u64-ness dma_addr_t. There is a dmaaddr_high_twhich behaves more expectedly, but it's not so widely used.